Papers Published

  1. Liao, I. C. and Chen, S. L. and Liu, J. B. and Leong, K. W., Sustained viral gene delivery through core-shell fibers, Journal of Controlled Release, vol. 139 no. 1 (2009), pp. 48-55 .
    (last updated on 2010/06/11)

    Abstract:
    Although viral gene transfer is efficient in achieving transgene expression for tissue engineering, drawbacks of virus dissemination, toxicity and transient gene expression due to immune response have hindered its widespread application. Many tissue engineering studies thus opt to genetically engineer cells in vitro prior to their introduction in vivo. However, it would be attractive to obviate the need for in vitro manipulation by transducing the infiltrating progenitor cells in situ. This study introduces the fabrication of a virus-encapsulated electrospun fibrous scaffold to achieve sustained and localized transduction. Adenovirus encoding the gene for green fluorescent protein was efficiently encapsulated into the core of poly(epsilon-caprolactone) fibers through co-axial electrospinning and was subsequently released via a porogen-mediated process. HEK 293 cells seeded on the scaffolds expressed high level of transgene expression over a month, while cells inoculated by scaffold supernatant showed only transient expression for a week. RAW 264.7 cells cultured on the virus-encapsulated fibers produced a lower level of IL-1 beta, TNF-alpha and IFN-alpha, suggesting that the activation of macrophage cells by the viral vector was reduced when encapsulated in the core-shell PCL fibers. in demonstrating sustained and localized cell tramsduction, this study presents an attractive alternative mode of applying viral gene transfer for regenerative medicine. (C) 2009 Elsevier B.V. All rights reserved.

    Keywords:
    viral gene therapy substrate-mediated delivery tissue engineering electrospinning localized gene delivery recombinant adenovirus in-vivo vectors therapy nanofibers release optimization expression scaffolds antibody